| 41. | The eyes are immediately followed by the spiracles.
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| 42. | The spiracles look like black dots and are located in between the black rings.
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| 43. | Spiracles white ringed with red and red centers.
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| 44. | It has a hexagonal shaped sternal plate on the thorax and prominent abdominal spiracles.
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| 45. | A spiracle is present, but small.
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| 46. | Sawfish breathe with two spiracles just behind the eyes that draw water to the gills.
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| 47. | The larva is amphipneustic ( having only the anterior and posterior pairs of spiracle ).
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| 48. | The eyes and well-developed spiracles are located on the top of the head.
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| 49. | The larva is amphipneustic ( having only the anterior and posterior pairs of spiracles ).
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| 50. | The posterior spiracles ( on the anal segment ) are usually on two cylindrical lobes.
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